大变形橄榄石动态重结晶的实验观测研究

CORC > 北京大学 > 地球与空间科学学院

	大变形橄榄石动态重结晶的实验观测研究; Experimental observation of dynamic recrystallization in olivine
	赵永红
刊名	岩石学报
	2013
关键词	扭转大变形橄榄石动态重结晶晶格最优取向(LPO) 颗粒尺寸高温高压实验观测 High strain torsion Olivine Dynamical recrystallization LPO Grain size High-temperature and high-pressure Experimental observation
英文摘要	本文利用高温高压大变形扭转实验,对富铁橄榄石大变形情况下的动态重结晶和颗粒尺度变化的特点进行了实验观测分析。富铁橄榄石集合体由纯铁橄榄石Fa100和圣卡罗橄榄石Fa10混合物经人工合成得到,试件的几何形状为圆柱体,直径9.6mm,高度4.86mm。实验在常角速率条件下进行,温度为1473K,围压为300MPa,剪应力为72～99MPa,剪应变率为1.35×10-4～3.11×10-4s-1,累积剪应变为3.98。对变形后样品的微结构进行了光学和扫描电镜的观测分析,得到橄榄石颗粒随应变增加而产生动态重结晶的具体物理图像,由EBSD观测结果给出了晶格取向随外加应变增加而产生的变化过程,利用两种统计...; In this paper torsion experiments on Fe rich olivine aggregates were conducted in a high- pressure and high-temperature gas medium torsion apparatus under anhydrous condition to analyze the grain size changes and dynamic recrystallization under different deformation. The Fe rich aggregates were synthesized from Fa(100) and Fa(10) mixture. The geometry of the sample was a cylinder with similar to 9.6mm in diameter and similar to 4.86mm in length encapsuled by the Ni sleeve to buffer the oxygen fugacity at olivine stability field. The small element in the sample undergoes deformation at constant strain rate by simple shear. A temperature of 1473K and a confining pressure of 300MPa at a constant angular velocity were applied during the torsion experiment. The applied shear strain rate ranged from 1.35 x 10(-4) to 3.11 x 10(-4) s(-1), yielding shear stresses of 72 similar to 99MPa supported by the sample and an accumulative shear strain of 3.98 were achieved at the end. Microstructure was analyzed with optical and electron microscopy. A series of parallel sections were examined starting near the outside edge of the cylindrical sample and proceeding to the central section. The Electron Backscatter Diffraction (EBSD) was performed on the central profile to determine the Lattice Preferred Orientation (LPO) changes with different strains. The observation is consistent with the LPO reported by Bystricky et al. (2000) for samples of San Carlos Fo(90) olivine.; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 3; 03; 967-976; 29
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/84868]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	赵永红. 大变形橄榄石动态重结晶的实验观测研究, Experimental observation of dynamic recrystallization in olivine[J]. 岩石学报,2013.
APA	赵永红.(2013).大变形橄榄石动态重结晶的实验观测研究.岩石学报.
MLA	赵永红."大变形橄榄石动态重结晶的实验观测研究".岩石学报 (2013).